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Modbus Master/Slave for ControlLogix and Logix-XT

Modbus Master/Slave Enhanced Network Interface Module for ControlLogix


The MVI56E Communication Module allows for Modbus Master and/or Slave connectivity from Rockwell Automation® ControlLogix® processors to Modbus RTU/ASCII devices. Each MVI56E port can be configured as a Master or Slave.

The MVI56E-MCM and MVI56E-MCMXT act as input/output modules on the ControlLogix backplane, making Modbus data appear as I/O data to the processor. Two independently configurable serial ports can operate on the same or different Modbus networks. The MVI56E-MCM is designed for standard process applications and the MVI56E-MCMXT is designed for the Logix-XT™ control platform, allowing it to operate in extreme environments. It can tolerate higher operating temperatures, and has conformal coating to protect it from harsh or caustic conditions.


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Features and Benefits

Backward Compatibility

  • All MVI56E products are backward-compatible with earlier MVI56 modules allowing direct replacement without the need to change existing controller programs

10,000 Word Database

  • Allows you to gather more data from your devices, which improves operational performance
  • Enjoy Enhanced features and flexibility without incurring expensive reprogramming costs

Add-On Instruction

  • Module configuration stored within the RSLogix™ 5000 project (ACD file)
  • No additional programming or configuration software is required
  • Add-On Instruction for RSLogix 5000 version 16 or higher cuts development time and costs

CIPconnect® Enabled

  • Facilitates remote user access across the ControlLogix backplane through Rockwell Automation’s 1756-ENBT module
  • Configure, diagnose, and analyze process data and communications status
  • Bridge through multiple ENBT/CNBT links to connect to MVI56E-MCMs installed in remote chassis for configuration and diagnostics

Add-On Profile

  • Simplifies adding the module in an RSLogix 5000 project


  • Backward-compatible with previous MVI56-MCM version
  • Single Slot - 1756 ControlLogix® backplane compatible
  • 10/100 MB Ethernet port for network configuration and diagnostics with Auto Cable Crossover Detection
  • User-definable module data memory mapping of up to 10,000 16-bit registers
  • 4-character, scrolling, alphanumeric LED display of status and diagnostic data in plain English
  • ProSoft Discovery Service (PDS) software finds the module on the network and assigns a temporary IP address to facilitate module access




Backplane Current Load

800 mA @ 5 V DC3 mA @ 24 Vdc

Operating Temperature

0°C to 60°C (32°F to 140°F) - MVI56E-MCM
-25°C to 70°C (-13°F to 158°F) - MVI56E-MCMXT

Storage Temperature

-40°C to 85°C (-40°F to 185°F)


30g Operational
50g non-operational
Vibration: 5 g from 10 to 150 Hz

Relative Humidity

5 to 95% (without condensing)

LED Indicators

Battery Status (ERR)

Application Status (APP)

Module Status (OK)

4-Character, Scrolling, Alpha-Numeric LED Display

Shows Module, Version, IP, Port Master/SlaveSetting, Port Status, and Error Information

Debug/Configuration Ethernet port (E1 - Config)

Ethernet Port

10/100 Base-T, RJ45 Connector, for CAT5 cable

Link and Activity LED indicators

Auto-crossover cable detection

Serial Application ports (P1 & P2)

Full hardware handshaking control, providing radio, modem, and multi-drop support

Software configurable communication parameters

Baud rate: 110 baud to 115.2kbps

RS-232, 485 and 422

Parity: none, odd or even

Data bits: 5, 6, 7, 8

Stop bits: 1 or 2

RTS on/off delay: 0 to 65535 milliseconds

Serial Applications Ports (P1, P2)

RJ45 (DB-9M with supplied adapter cable)

Configurable RS-232 hardware handshaking

500V Optical isolation from backplane

RS-232, RS-422, RS-485 jumper-select, each port

RX (Receive) and TX (Transmit) LEDs, each port

Shipped with Unit

RJ45 to DB-9M cables for each serial port

5 foot Ethernet Straight-Thru Cable (Gray)


ProSoft Configuration Builder (PCB) Last Modified 03/18/2014
MVI56E-MCM/MCMXT Datasheet 390.63 kB Last Modified 06/18/2014
MVI56E-MCM/MCMXT User Manual 4.35 MB Last Modified 07/17/2014
MVI56E-MCM Sample Ladder & Add-On Instruction 1.48 MB Last Modified 05/07/2013
MVI56E-MCM EDS File 1.51 kB Last Modified 08/13/2013
MVI56(E) Add-On Profile 6.48 MB Last Modified 05/22/2013
MVI56E-MCM Faceplate for Factory Talk 267.55 kB Last Modified 09/18/2012
MVI56E-MCM, MVI56E-MCMXT - Setup Tutorial N/A Last Modified 05/07/2013
MVI56E-MCM Diagnostics Tutorial N/A Last Modified 05/03/2013
MVI56E-MCM FAQ 138.50 kB Last Modified 05/29/2013



Ex Certificate (ATEX Directive) 108.10 kB Last Modified 05/20/2014
CB Safety 327.83 kB Last Modified 05/20/2014
CE Mark 90.86 kB Last Modified 05/20/2014
Russian GOST-R 1.23 MB Last Modified 11/01/2012
GOST-R Declaration of Conformity 6.68 MB Last Modified 11/01/2012
Korean KC Registration 586.65 kB Last Modified 11/01/2012
Lloyd's Register 2.13 MB Last Modified 11/01/2012
UL/cUL; Class 1, Div 2 1.12 MB Last Modified 05/20/2014
UL/cUL; Class 1, Div 2 (Canada) 1.14 MB Last Modified 05/20/2014